the only ones that i think may work in your case is a synthetic urine, maybe one like the whizzinator, although im not sure if they are still in existence ... either the synthetic urine, or get a friend of the same sex to piss in a cup for you and find a way to keep it the correct temperature and a way to attach it to your body.. like some sort of squirt bottle would work nicely... if you go the friends piss route, i would suggest practicing it a few times with just plain water till you feel comfortable and feel like its not completely obvious as to what you are doing..
good luck with the ua.. i just had to take one for a job, and its been such a pleasure being able to smoke again, lol..